Nick Edwards updates a dataset:
Login to powerbi.com and in the top right hand corner locate “Settings” and then “Admin portal”
Under “Tenant settings” locate “Developer Settings” and then “Allow service principles to user Power BI APIs”.
Set this service to “Enabled” using the toggle. Next under the heading “Apply to:” select “Specific security groups (Recommended)”. Next add the newly created security group “AzureSynapsePowerBIIntegration” and click apply.
Click through for the full process.